Battery Module Pad Layout for Uniform Cell Swelling Pressure
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Solution Overview
Problem
Battery modules face challenges due to swelling of battery cells, which can damage adjacent cells and affect the lifespan, stability, and uniformity of battery performance.
Innovation Solution
A battery module design that includes a first pad portion between adjacent battery cells and a second pad portion between the module case and a battery cell, with the surface pressure applied by the first pad portion being less than that applied by the second pad portion, to manage swelling and maintain uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a buffer pad is introduced into the battery module to suppress swelling of battery cells, then the reliability of the battery module is improved, but the device complexity increases due to additional components and their strategic placement
Solution Approach 1:
The buffer pad is divided into multiple regions (first region and second region) with different compression force deflection characteristics. The first region has a first CFD value while the second region has a second CFD value, allowing different parts of the same pad to provide different levels of support tailored to specific swelling patterns at different battery cell locations.
Solution Approach 2:
Different regions of the buffer pad are designed with locally optimized properties. The first region and second region have different CFD values to address varying swelling tendencies of battery cells at different positions within the module, providing localized support where needed rather than uniform support across the entire pad.
2Stability of the object's composition
If buffer pads with different surface pressures are applied at different positions, then the uniformity of battery cell performance is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The buffer pad incorporates regions with different CFD values to create locally optimized support characteristics. This allows the pad to provide higher or lower support forces at specific locations based on the swelling behavior of battery cells at those positions, achieving uniform performance across all cells while using a single integrated component.
Solution Approach 2:
The compression force deflection parameter is varied across different regions of the buffer pad. By changing the CFD value from the first region to the second region, the pad can adapt to different swelling patterns without requiring multiple separate components, thereby maintaining manufacturing simplicity while achieving performance uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves the lifespan and stability of the battery module by uniformly managing the swelling of battery cells, ensuring consistent performance across all cells.
Implementation Method 1
A buffer pad may be compressed in the direction in which the battery cell swells and then restored to suppress swelling of the battery cell
Data Source
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AI summary
A battery module in which the lifespan, displacement, voltage, capacity, etc. of each battery cell constituting the battery module are uniform according to one embodiment of the present disclosure may include: a module case forming an accommodating space; a plurality of battery cells disposed in the accommodating space; a first pad portion disposed between at least one pair of adjacent battery cells among the plurality of battery cells; and a second pad portion disposed between a side wall of the module case and a battery cell closest to the side wall of the module case, where the surface pressure applied by the first pad portion to an adjacent battery cell may be less than the surface pressure applied by the second pad portion to an adjacent battery cell.